[Antennas] measuring SWR

[Joe Mayenschein]

"Douglas J. Koehler" wrote:

> Mike,
>
> I've built around a dozen j-poles and variants in the past 10 years and
> what you've got is an impedance mismatch. Your feedline is 50 ohm
> unbalanced and your antenna is probably around 300 ohms unbalanced.

Now I also have built dozens of "J" Poles in my almost 30 years in this hobby,
And the above statement is a bit confusing to me,

Yes the balanced to un-balanced thing is correct,, BUT,, I beg to differ on the
300 ohm statement,,  IIRC the position of the taps determine the antennas
impedance.

0 ohms at the base of the stub (connected to the short)  and nearly infinite at
the end of the stub. or at least several thousand ohms,,

and everywhere in-between from 0 to the infinite.  That's why they are soo very
easy to match..

Joe WB9SBD